Switching Content Views Issue - iphone

Question

I'm attempting to switch views with an iPhone application- I have a parent view controller, SuperviewController, and then two views that I want to switch within that parent view, MainMenuController and MainGameController.
*EDIT*: I am now using navigation controllers:
SuperviewController.m
viewDidLoad
self.mainMenuController = [[MainMenuController alloc] initWithNibName:#"MainMenu" bundle:nil];
[[self navigationController] pushViewController:self.mainMenuController animated:NO];
switchToMainGame
self.mainGameController = [[MainGameController alloc] initWithNibName:#"MainGame" bundle:nil];
[[self navigationController] pushViewController:self.mainGameController animated:NO];
The app loads correctly with the mainMenu.xib. However, when calling switchToMainGame, nothing happens- it's as if XCode forgot what mainGameController is.
Thanks for any help.

Answer 1

You might consider swapping view controllers not views, using UINavigationController.
In your AppDelegate.h
#interface AppDelegate : NSObject <UIApplicationDelegate>
{
UIWindow *window;
UINavigationController *navigationController;
}
#property (nonatomic, retain) IBOutlet UIWindow *window;
#property (nonatomic, retain) IBOutlet UINavigationController *navigationController;
#end
And in -[AppDelegate applicationDidFinishLaunching:] instantiate navigationController, thus:
[self setNavigationController:[[UINavigationController alloc] initWithRootViewController:mySuperviewController]];
[[self navigationController] setNavigationBarHidden:YES];
// Configure and show the window
[window addSubview:[navigationController view]];
[window makeKeyAndVisible];
Then within SuperviewController.m you can instantiate your MainMenuController and MainGameController, as you already do. To start with MainMenuController you could do this in SuperviewController -viewDidLoad
[[self navigationController] pushViewController:[self mainMenuController] animated:YES];
You would need to add some smarts to switch directly between mainMenuController and mainGameController - but it wouldn't be difficult.
So as not to reload nibs again and again, consider defining accessor methods like this:
- (MainGameController*) mainGameController
{
if (mainGameController == nil)
{
mainGameController = [[MainGameController alloc] initWithNibName:#"MainGame" bundle:nil];
}
return mainGameController;
}
Also, bear in mind that switching between sibling view controllers involve popping current view controller (e.g., mainMenuController) before pushing other view controller (e.g., mainGameController).